nutburger
/ˈnʌtˌbəːɡə/(also nutberger)
noun
Originally: a hamburger topped with nuts. Now (usually): a savoury round flat cake or patty made from chopped nuts and other vegetarian ingredients; a bread bun containing this.
Origin
1930s; earliest use found in Maurice Harley Weseen (1890–1941). From nut + burger.